I did have a good GK before but later in his career he became ****, but the most of the team became **** at that time, so don't know what happened. In his early career, he was very active, making super and great saves, including in associations. At that time, I did not have a weak team, and in fact, I had one of my all time best teams. He was the best GK I ever had . For me, what defines a good GK is his activity with respect to number of shots on target. I mean, you can feel he is present, not like some loose hole that is half asleep between the posts. A good GK will step up and do man of the match performances if required, and he will make the difference in tight matches.
All that being said, even the best players have some bad days, but on overall, based on performance relative to quality, they clearly better and also consistent.